Mobile Communications I - IHP Microelectronics
Mobile Communications I - IHP Microelectronics
Mobile Communications I - IHP Microelectronics
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History of wireless communication I1896 Guglielmo Marconi first demonstration of wirelesstelegraphy (digital!) long wave transmission, hightransmission power necessary (> 200kw)1907 Commercial transatlantic connections huge base stations(30 100m high antennas)1915 Wireless voice transmission New York - San Francisco1920 Discovery of short waves by Marconi reflection at the ionosphere smaller sender and receiver, possible due to the invention of the vacuumtube (1906, Lee DeForest and Robert von Lieben)1926 Train-phone on the line Hamburg - Berlin wires parallel to the railroad trackDr.-Ing. Jean-Pierre Ebert MC-I SS07 1.16